Base QP Model

Model Question Paper - Electrical Machines KALVI WORLD COMMON APTITUDE TEST - 1 MODEL QUESTION PAPER Subject: Electrical Machines Class: Diploma EEE Max Marks: 100 Time: 3 Hours GENERAL INSTRUCTIONS: Answer all questions in Part A (Short Answer Questions) Attempt any 5 questions from Part B (Descriptive Questions) Neat diagrams must be drawn wherever necessary Assume suitable data if necessary and mention it clearly Use of non-programmable calculator is permitted PART A – SHORT ANSWER QUESTIONS 10 × 2 = 20 Marks Q.No Question 1. What is a PN junction diode? 2. Define Fermi level in semiconductors. 3. State Lenz's law. 4. What is slip in an induction motor? 5. List any two applications of stepper motors. 6. Define back EMF in DC motors. 7. What is the function of a commutator? 8. State the condition for resonance in an RLC circuit. 9. What is the use of a capacitor in a single-phase motor? 10. Define efficiency of a transformer. PART B – DESCRIPTIVE QUESTIONS 5 × 16 = 80 Marks Q.No Question 11. a) With a neat diagram